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    <p>The basic problem is that you are using <code>regex_match</code> when you should be using <code>regex_search</code>:</p> <blockquote> <p>The algorithms regex_search and regex_match make use of match_results to report what matched; the difference between these algorithms is that regex_match will only find matches that consume all of the input text, where as regex_search will search for a match anywhere within the text being matched.</p> </blockquote> <p><a href="http://www.boost.org/doc/libs/1_39_0/libs/regex/doc/html/boost_regex/introduction_and_overview.html" rel="noreferrer">From the boost documentation</a>. Change it to use <code>regex_search</code> and it will work.</p> <p>Also, it looks like you are not capturing the matches. Try changing the regex to this:</p> <pre><code>regex re("(\\d*)"); </code></pre> <p>Or, maybe you need to be calling <code>regex_search</code> repeatedly:</p> <pre><code>char *where = s.c_str(); while (regex_search(s.c_str(), matches, re)) { where = m.suffix().first; } </code></pre> <p>This is since you only have one capture in your regex.</p> <p>Alternatively, change your regex, if you know the basic structure of the data:</p> <pre><code>regex re("(\\d+).*?(\\d+)"); </code></pre> <p>This would match two numbers within the search string.</p> <p>Note that the regular expression \d* will match zero or more digits - this includes the empty string "" since this is exactly zero digits. I would change the expression to \d+ which will match 1 or more.</p>
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    1. COAwesome. Thanks 1800 INFORMATION. I didn't realize how much of a noob I was in boost.regex. (In my defense both "The Regulator" and Expresso give me positive results in response to "Match", so I honed in a similarly named method in boost.regex.) I guess I didn't fathom the significance of the difference between regex_match and regex_search till you pointed it out. Thanks again. I wonder if there is anyway to reduce my "reputation score" even further to display my noobness :).
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    2. COI tested your suggestion 1800 INFORMATION to replace regex_match with regex_search and now I get two strings: "0" and " ". I don't seem to get the 2nd one as "1". Any suggestions on what I could still be missing?
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    3. COIt looks like you aren't capturing the strings you match, try putting the () around the expression
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